.head {
  width: 100vw;
  height: 45px;
  background: #ccc;
}

.dibu {
  width: 100vw;
  height: 100px;
  background: #ccc;
}

.dibu div {
  width: 100%;
  height: 50%;
  text-align: center;
}

.dibu div button {
  width: 90%;
  height: 80%;
  background: #fff;
  border: none;
  border-radius: 10px;
  margin: 5px auto;
  font-size: 20px;
  color: #00f;
  font-weight: 400;
  border: 1px solid #00f;
}
